关键词: 鸭瘟鸭病毒性肝炎二联苗, 雏鸭, 早期免疫, 效果, 鸭病[49NA]

Abstract: In this paper the studies on the early stage immunization of the bivalent attenuated vaccines against Duck Plague(DP) and Duck Viral Hepatitis(DVH)is reported. Sichuan flaxen ducklings without maternal antibody and with maternal antibody were used in the experiment. The duckings have been immunized by different routes(Subcutaneous, in drinking water, nose dripping and spraying). The results indicated: 1. The best immunization routes on duckings without maternal antibody are subcutaneous and in drinking water(Subcutaneous injection is slightly better than that in drinking water), ①all 4-day old immunized ducklings immunized by subcutaneous injection and in drinking water could resist the challenge of 10-thousand LD 50 virulent DHV; ②all 4-day old immunized ducklings immunized by subcutaneous injection and in drinking water could resist the challenge of 10-thousand M. L. D. virulent DPV, and 2 months later, the protection rate was 100%. 2. The best immunization routes on duckings with maternal antibody is that in drinking water, ① all 5-day old immunized ducklings immunized by that in drinking water could resist the challenge of 10-thousand LD 50 virulent DHV; ② all 4-day old immunized ducklings immunized by subcutaneous injection and in drinking water could resist the challenge of 10-thousand M. L. D. virulent DPV, the immunity period lasted for at least 2 months.

Key words: THE BIVALENT ATTENUATED VACCINES AGAINST DP AND DVH, DUCKLINGS, EARLY STAGE IMMUNIZATION, EFFECT, DUCK DISEASE